'The U.S. Food and Drug Administration (FDA) recently issued new restrictions for four popular long-acting asthma drugs. Novartis AG's Foradil, GlaxoSmithKline's Serevent and Advair, and AstraZeneca's Symbicort, all contain an ingredient that relaxes airway muscles in the lungs which can cause asthma-related death. If not accompanied by other asthma drugs to offset this life-threatening side effect, the consequences could be fatal.

These drugs have long contained a label that reads, "increases risk of asthma-related death", but apparently this warning is not enough for this extreme class of medications. Known as long-acting beta-agonists (LABAs), these asthma drugs are used by roughly six million asthma sufferers to combat asthma symptoms. Ironically, LABAs are so dangerous that, if not combined with other asthma drugs, can actually cause an asthma attack.'

Read more: FDA Finally Admits That Asthma Drugs Can Actually Cause Serious Asthma Attacks